Characteristics of arbidol-resistant mutants of influenza virus: Implications for the mechanism of anti-influenza action of arbidol

IA Leneva, Rupert James Martin Russell, YS Boriskin, AJ Hay

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259 Citations (Scopus)

Abstract

The antiviral drug arbidol (ARB), which is licensed in Russia for use against influenza, is known to inhibit early membrane fusion events in influenza A and B virus replication. To investigate in more detail the target and mechanism of ARB action we generated and studied the characteristics of ARB-resistant influenza virus mutants. Observations of the ARB susceptibility of reassortants between A/Singapore/1/57(H2N2)and A/chicken/Germany/27(H7N7, "Weybridge" strain) and of mutants of the latter virus identified the virus haemagglutinin (HA) as the major determinant of ARB sensitivity. ARB-resistant mutants, selected from the most sensitive reassortant, possessed single amino acid substitutions in the HA2 subunit which caused an increase in the pH of fusion and the associated conformational change in HA. ARB was shown to stabilize the HA by causing a 0.2 pH unit reduction in the pH of the transition to the low pH form, which was specifically abrogated by the resistance mutations. Some of the resistance mutations, which reduce acid stability and would disrupt ARB-HA interactions, are located in the vicinity of a potential ARB binding site identified using the docking programme Gold. Together, the results of these investigations indicate that ARB falls within a class of inhibitor which interacts with HA to stabilize it against the low pH transition to its fusogenic state and consequently inhibit HA-mediated membrane fusion during influenza virus infection. (C) 2008 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)132-140
Number of pages9
JournalAntiviral Research
Volume81
DOIs
Publication statusPublished - Feb 2009

Keywords

  • Arbidol
  • Arbidol-resistant mutants
  • Influenza haemagglutinin
  • Low pH conformational change
  • Inhibition of membrane fusion
  • A VIRUS
  • NEURAMINIDASE INHIBITOR
  • CONFORMATIONAL-CHANGE
  • MEMBRANE-FUSION
  • VIRAL FUSION
  • M2 PROTEIN
  • IN-VITRO
  • HEMAGGLUTININ
  • AMANTADINE
  • REPLICATION

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